高二上学期第四次月考数学理试题 含答案I文档格式.docx
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D.a=20,b=30,A=30°
9.如图,正四棱锥的所有棱长相等,E为PC的中点,则
异面直线BE与PA所成角的余弦值是()
A.B.
C.D.
10.已知等差数列中,有,且该数列的前项和有最大值,则使得成立的的最大值为( )
A.11B.19C.20D.21
11.若椭圆和双曲线有相同的焦点F1、F2,P是两曲线的交点,则的值是()
A.B.C.D.
12.椭圆与圆(为椭圆半焦距)有四个不同交点,则椭圆离心率的取值范围是()
第Ⅱ卷
二、填空题:
(本大题共4小题,每小题5分,共20分.)
13.在等差数列{an}中,Sn表示前n项和,a2+a8=18-a5,则S9=________。
14.已知,若恒成立,则实数的取值范围是________。
15.双曲线的一条渐近线与直线垂直,则这双曲线的离心率为________。
16.若直线与抛物线交于、两点,若线段的中点的横坐标是,则______。
三、解答题:
(本大题共6小题,共70分.解答题应写出文字说明、证明过程或演算步骤.
(1)求数列的通项公式;
(2)若
的前项和
18.(12分)设命题,命题
,若“”为假命题,“”为真命题,求实数的取值范围
19.(12分)在中,角、、所对的边是,且
(1)求的值;
(2)若,求面积的最大值.
20.(12分)已知四棱锥的底面为直角梯形,,底面,且,,是的中点。
(Ⅰ)证明:
面面;
(Ⅱ)求与所成的角的余弦值;
(Ⅲ)求面与面所成二面角的余弦值。
21(12分)已知抛物线的焦点为F,A是抛物线上横坐标为4、且位于轴上方的点,A到抛物线准线的距离等于5。
(1)求抛物线方程;
(2)过A作AB垂直于轴,垂足为B,O为坐标原点,以OB为直径作圆M,是轴上一动点,若直线AK与圆M相离.求m的取值范围。
22.(12分)
已知椭圆=1(a>b>0)的离心率,过点A(0,-b)和B(a,0)的直线与原点的距离为.
(1)求椭圆的方程.
(2)已知定点E(-1,0),若直线y=kx+2(k≠0)与椭圆交于C、D两点.问:
是否存在k的值,使以CD为直径的圆过E点?
请说明理由.
西华一高高二四次月考数学试题
参考答案(理)
DBBCDDDCDBDA
(本大题共4小题,每小题5分).
(13)54.(14)(15)(16)
三、解答题:
(解答应写出文字说明,证明过程或演算步骤)
17.
18.解:
由,得,
因此,或,
由
,得
因此或,
因为是的必要条件,所以,
即
.
因此
解得.
19.
(1)
……(2分)
……(4分)
……(6分)
(2)由得:
……(7分)
(当且仅当时取“=”号)
……(10分)
故:
面积的最大值为……(12分)
20.证明:
以为坐标原点长为单位长度,如图建立空间直角坐标系,则各点坐标为
.
因
由题设知,且与是平面内的两条相交直线,由此得面.又在面上,故面⊥面.
(Ⅱ)解:
(Ⅲ)解:
在上取一点,则存在使
要使
为
所求二面角的平面角.
21.解:
(1)抛物线
∴抛物线方程为y2=4x.……………5分
(2)由题意得,圆M的圆心是点(0,2),半径为2.……………7分
当m=4时,直线AK的方程为x=4,此时,直线AK与圆M相离,
当m≠4时,直线AK的方程为……………9分
即为
圆心M(0,2)到直线AK的距离,令
时,直线AK与圆M相离;
………13分
22.(12分)解析:
(1)直线AB方程为:
bx-ay-ab=0.
依题意
解得
∴ 椭圆方程为 .…………………………4分
(2)假若存在这样的k值,由得.
∴
. ①
设,、,,则
②
…………………………………………8分
而
要使以CD为直径的圆过点E(-1,0),当且仅当CE⊥DE时,则,即.…………………………………………10分
. ③
将②式代入③整理解得.经验证,,使①成立.
综上可知,存在,使得以CD为直径的圆过点E.………………………12分
试卷类型:
A卷河北冀州中学
2019-2020年高二上学期第四次月考英语试题A卷含答案
第一部分听力(共两节,满分30分)
第一节(共5小题;
每小题1.5分,满分7.5分)
听下面5段对话。
每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。
听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。
每段对话仅读一遍。
1.Whatdidthemandolastweekend?
A.Hewentcamping.
B.Heattendedaparty.
C.Hestayedhomewithhisfriends.
2.WhendidthewomanmeetAnna?
A.At7:
55.B.At7:
58.C.At8:
02.
3.WhydoesthewomanrememberJamessowell?
A.Hehasafunnyface.
B.Hewasthefirstpersonshemetatschool.
C.Hewaslateforschoolonthefirstday.
4.Whatdoweknowabouttheman?
A.Heiseagertomeettheboss.
B.Heisgoingtogiveatalkonfishing.
C.Hehasthesamehobbyastheboss.
5.Whatdoesthewomanmean?
A.Bobneverstudieshard.
B.Bobhasbeenstudyinghardlately.
C.Bobstartedpreparingforthetestlongago.
第二节
每段对话后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。
听每段对话前,你将有时间阅读各个小题,每小题5秒钟;
听完后,各小题将给出5秒钟的作答时间。
每段对话读两遍。
听第6段材料,回答第6、7题。
6.Whatdidthewomandreamabout?
A.Themanhadanaccident.
B.Thebosswantedtofiretheman.
C.Themanwasgoingtogiveuphisjob.
7.What’stherelationshipbetweenthespeakers?
A.Colleagues.B.Doctorandpatient.C.Husbandandwife.
听第7段材料,回答第8、9题。
8.Whydidthewomancalltheman?
A.Tocancelabooking.B.Tomakeareservation.C.Tochangehertrip.
9.Whendoesthehotelhaveaspecialoffer?
A.InJanuary.B.InFebruary.C.InMarch.
听第8段材料,回答第10至l2题。
10.WhomightJohnnybe?
A.Theman’sson.B.Theman’sbrother.C.Thewoman’sbrother.
11.Whatwillthemandotoday?
A.Goshopping.B.Meetsomefriends.C.Playbasketball.
12.Whatkindoflifedoesthewomanlive?
A.Verybusy.B.Easy.C.Interesting.
听第9段材料,回答第13至l6题。
13.Wheredoestheconversationprobablytakeplace?
A.Onthephone.B.Attheoffice.C.Inarestaurant.
14.Whatdoesthewomanthinkisthekeypartofthewholeoperation?
A.Havingearlystudies.B.Havingagoodproduct.C.Gettingagoodimportagent.
15.Whatkindofpanydoesthemanworkfor?
A.Aphonepany.B.Abicyclepany.C.Afurnituredesignpany.
16.Whatdoesthewomanmeanintheend?
A,Shewillselltheproduct.
B.Shewillhelpthemanwiththereport.
C.Shehasn’tbeenconvincedbytheman.
听第l0段材料,回答第17至20题。
17.Whydidthespeaker’sfamilymovetoNewYorkCity?
A.Tomoveintoasmallerapartment.B.Togotoabetterschool.
C.Toexperiencemorecultures.
18.Whatdidthespeakerdislikeabouthernewbuilding?
A.Itwasnoisyoutside.B.Itwasfarfromherschool.
C.Itwasn’tinasafeneighborhood.
19.Whatwasthespeaker’sfavoritethingaboutthecity?
A.Eatingdeliciousfood.B.Goingtomuseumsandtheatres.
C.Makingalotofnewfriends.
20.Whatdidthespeakermainlythinkofthecity?
A.Itwasmostlypositive.B.Everythingwasachallenge.
C.Thingschangedfrombadtogood.
第二部分 阅读理解(共两节,满分40分)
第一节 (共15小题;
每小题2分,满分30分)
阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。
A
Iwasneververyneat,whilemyroommateKatewasextremelyorganized.Eachofherobjectshaditsplace,butminealwayshidsomewhere.Sheevenlabeled(贴标签)everything.Ialwayslookedforeverything.Overtime,KategotneaterandIgotmessier.Shewouldpushmydirtyclothingover,andIwouldlaymybooksonhertidydesk.Webothgottiredofeachother.
Warbrokeoutoneevening.Katecameintotheroom.Soon,Iheardherscreaming.“Takeyourshoesaway!
Whyundermybed!
”Deafened,Isawmyshoesflyingatme.Ijumpedtomyfeetandstartedyelling.Sheyelledbacklouder.
Theroomwasfilledwithanger.Wecouldnothavestayedtogetherforasingleminutebutforaphonecall.Kateansweredit.Fromherendoftheconversation,Icouldtellrightawayhergrandmawasseriouslyill.Whenshehungup,shequicklycrawled(爬)underhercovers,sobbing.
Obviously,thatwasnotsomethingsheshouldnotgothroughalone.Allofasudden,awarmfeelingofsympathyroseupinmyheart.
Slowly,Icollectedthepencils,tookbackthebooks,mademybed,cleanedthesocksandsweptthefloor,evenonherside.IgotsointomyworkthatIevendidn’tnoticeKatehadsatup.Shewaswatching,hertearsdriedandherexpressiononeofdisbelief.Then,shereachedoutherhandstograspmine.Ilookedupintohereyes.Shesmiledatme,“Thanks.”
KateandIstayedroommatesfortherestoftheyear.Wedidn’talwaysagree,butwelearnedthekeytolivingtogether:
givingin,cleaningupandholdingon.
21.WhatmadeKatesoangryoneevening?
A.Shecouldn’tfindherbooks.
B.Sheheardtheauthorshoutingloud.
C.Shegotthenewsthathergrandmawasill.
D.Shesawtheauthor’sshoesbeneathherbed.
22.Theauthortidieduptheroommostprobablybecause_______.
A.shewasscaredbyKate’sanger
B.shehatedherselfforbeingsomessy
C.shewantedtoshowhercare
D.shewasaskedbyKatetodoso
23.HowisParagraph1mainlydeveloped?
A.ByanalyzingcausesB.Byshowingdifferences
C.BydescribingaprocessD.Byfollowingtimeorder
24.Whatmightbethebesttitleforthestory?
A.MyFriendKateB.HardWorkPaysOff
C.HowtoBeOrganizedD.LearningtoBeRoommates
B
Aschoolgirlsavedherfather'
slifebykickinghiminthechestafterhesufferedaseriousallergic(过敏的)reactionwhichstoppedhisheart.
Izzy,nine,restartedfatherColm'
sheartbystamping(踩)onhischestafterhefelldownathomeandstoppedbreathing.
Izzy'
smother,Debbie,immediatelycalled999butIzzyknewdoctorswouldneverarriveintimetosaveherfather,soshedecidedtouseCPR.
However,shequicklydiscoveredherarmsweren'
tstrongenough,soshestampedonherfather'
schestinstead.
Debbiethentookoverwithsomemoreconventionalchestpressions(按压)untiltheambulancearrived.
Izzy,whohasbeengivenabraveryawardbyherschool,said:
"
Ijustkickedhimreallyhard.MymumtaughtmeCPRbutIknewIwasn'
tstrongenoughtousehands.Iwasquitescared.ThedoctorsaidImightaswellbeadoctororanurse.MymumsaidthatDadwasgoingtohospitalwithabigfootprintonhischest.
"
She'
salittlestar,"
saidDebbie,"
IwasreallyupsetbutIzzyjusttookover.Ijustcan'
tbelievewhatshedid.Ireallythinkallchildrenshouldbetaughtfirstaid.IzzydidCPRthenthedoctorturnedup.Colmhadtohavemoretreatmentonthewaytothehospitalandwe'
vegottoseeanexpert."
TruckdriverColm,35,sufferedamysteryallergicreactiononSaturdayandwastakentohospital,butwassenthomeonlyforittohappenagainthenextday.Thesecondattackwassoseriousthathisairwayswelled,preventinghimfrombreathing,hisbloodpressuredroppedsuddenly,andhisheartstoppedforamoment.
Hehasnowmadeafullrecoveryfromhissuffering.
25.Izzykickedherfatherinthechest______.
A.toexpressherhelplessnessB.topracticeCPRonhim
C.tokeephimawakeD.torestarthisheart
26.What'
stherightorderoftheevents?
①IzzykickedColm②Debbiecalled999
③IzzylearnedCPR④Colm’sheartstopped.
A.③①②④B.④②③①C.③④②①D.④③①②
27.WhatdoesParagraph8mainlytalkabout?
A.WhatColmsuffered.B.Colm'
spresentcondition.
C.WhatcausedColm'
sallergy.D.SymptomsofColm'
sallergicreaction.
28.Whydoestheauthorwritethenews?
A.Todescribeaserious